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Preparation of norcantharidin analogues. (i) CrCl3·6H2O, [BMIM]Cl, 120 °C (H2SO4, [BMIM]Cl, 65 °C); (ii) NaBH4, water; (iii) alkylation or acylation; (iv) maleic anhydride, THF; (v) H2, 1 atm, 10% Pd/C, THF. *—yield using step-by-step procedure.
